by W. Elwyn (Waldo Elwyn) Backus
by Lester Del Rey
by Charles Dixon
by Charles L. Fontenay
by T. D. Hamm
by Niels Meyn, August Klingsey
by Walter L. Kleine
by Noel M. Loomis
by Hans Dominik
by William Tenn
by G. C. Edmondson
by Allen Kim Lang
by Roger D. Aycock
by Joe Gibson
by Carl Ignaz Geiger
by Winston K. (Winston Kinney) Marks
by Arnold Marmor
by Ray C. Noll